When I did mine I had the new pistons and pins put on the conrods by a company in Fleetwood they are called Redmans. It was just over £30 (now £35). They do a postal service but I dropped them in. Really nice guys. Might be an option?
https://www.ebay.co.uk/itm/conrod-pi...QAAOxyaTxRSQ4r
Regards John